$\csc\left(54^{\circ}\right)\sec\left(54^{\circ}\right)$

$\int\left(20x^4\cdot\left(x^5-1\right)^7\right)dx$

$-48x+32$

$\int\left(\frac{1}{\left(3x-7\right)^5}\right)dx$

$\int\frac{x^2+3}{\left(x+2\right)\left(x-1\right)}dx$

$\int\frac{125+55x+4x^2}{\left(x-5\right)\left(x+5\right)^2}dx$

$75^2$